package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import io.swagger.v3.oas.annotations.parameters.RequestBody;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    @Transactional
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断购物车中是否有该商品
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long usertId = BaseContext.getCurrentId();
        shoppingCart.setUserId(usertId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //有：修改数量
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);//update shopping_cart set number = ? where id = ?
            shoppingCartMapper.updateById(cart);
        }else {
            //无：添加到购物车
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                //判断是否为菜品
                Dish byId = dishMapper.getById(dishId);
                shoppingCart.setName(byId.getName());
                shoppingCart.setImage(byId.getImage());
                shoppingCart.setAmount(byId.getPrice());

            } else {
                //判断是否为套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> list() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    /**
     * 购物车数量减一
     * @param shoppingCartDTO
     */
    public void sub(ShoppingCartDTO shoppingCartDTO) {

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long usertId = BaseContext.getCurrentId();
        shoppingCart.setUserId(usertId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        // 判断购物车中该商品的数量是否大于1
        if (list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            if (cart.getNumber() == 1){
                // 删除
                shoppingCartMapper.deleteById(cart.getId());
            }else {
                // 修改
                cart.setNumber(cart.getNumber() - 1);
                shoppingCartMapper.updateById(cart);
            }
        }
    }
}
